.book_box,
.news_box {
    width: 1100px;
    margin: 20px auto;
    background-color: #f2f2f2;
    text-align: center;
    padding: 50px 50px;
}

.book_box_left {
    float: left;
    width: 185px;
    padding: 20px 50px 0px 50px;
    background-color: #f2f2f2;
}

.book_box_right {
    float: left;
    width: 815px;
    overflow: hidden;
    text-align: left;
}

.book_box_right p,
.book_box_right h1 {
    line-height: 2em;
}

.book_box_center {
    height: 50px;
    line-height: 50px;
    border-bottom: 1px solid #ccc;
    padding-top: 30px;
}

.book_box li {
    float: left;
    border-bottom: 1px solid #ccc;
}

.book_box li a {
    display: inline-block;
    line-height: 40px;
    padding: 20px 50px 0 0;
    color: #151515;
}

.book_box li a:hover {
    color: orange;
}

.news_box p {
    font-size: 16pt;
    color: #555;
    text-indent: 2em;
    line-height: 2em;
    margin: 1em 0;
    /*实现两端文本对齐*/
    text-align: justify;
}